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ft_itoa_base.c
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ft_itoa_base.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_itoa_base.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dfonarev <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/04/27 01:45:04 by dfonarev #+# #+# */
/* Updated: 2019/05/02 23:43:37 by dfonarev ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static char *zero_string(void)
{
char *str;
if (!(str = malloc(2)))
return (NULL);
str[0] = '0';
str[1] = '\0';
return (str);
}
/*
** mode = 0: lowercase letters;
** mode = 1: uppercase letters
**
** check for negative numbers and base != 10 ???
*/
char *ft_itoa_base(long long value, int base, int mode)
{
unsigned long long val;
int sign;
int len;
const char sym[] = "0123456789abcdef";
char *str;
if (!value)
return (zero_string());
sign = (value < 0 && base == 10) ? -1 : 1;
len = (value < 0 && base == 10) ? 1 : 0;
val = (sign == -1) ? value * -1 : value;
len += ft_numlen(val, base);
str = ft_strnew(len);
while (--len >= 0)
{
if (sym[val % base] >= '0' && sym[val % base] <= '9')
str[len] = sym[val % base];
else
str[len] = sym[val % base] - (mode * 32);
val /= base;
}
if (sign == -1)
str[++len] = '-';
return (str);
}